msm: ipc: Fix the build error

msm_ipc_router_hsic_driver_register accesses "pdev" variable which is not
defined. Fix the build error by accessing the concerned information
from the input parameter of the function.

Change-Id: I9932e7e5cdbdfaa04e7387c921a3fd40812d22f0
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>